Tirage.java

import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.*;

public class Tirage {

    private final String[] names = {
            "Mehdi", "Houda", "Zouhair", "Salma", "Fatimazahra", "Hamza", "Yassir", "Ghita"
    };

    private final String[] topics = {
            "CLASS", "PAQUETAGE", "ETATS-TRANSITION", "OCL"
    };

    public static void main(String[] args) {
        new Tirage().start();
    }

    public void start() {
        List<String> nameList = new ArrayList<>(Arrays.asList(names));
        List<String> topicList = new ArrayList<>(Arrays.asList(topics));

        Random r = new Random();
        HashMap<String, List<String>> map = new HashMap<>();
        for (String topic : topics) map.put(topic, new ArrayList<>());

        while (!nameList.isEmpty()) {
            int index = r.nextInt(nameList.size());
            int topicIndex = r.nextInt(topicList.size());
            if (map.get(topicList.get(topicIndex)).size() == 2) {
                topicList.remove(topicIndex);
            } else {
                map.get(topicList.get(topicIndex)).add(nameList.get(index));
                nameList.remove(index);
            }
        }
        printResult(map);
    }

    private void printResult(HashMap<String, List<String>> map) {
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
        for (String topicName : map.keySet()) {
            out.print("The Diagramme " + topicName + " is Going to be handled by => ");
            for (String name : map.get(topicName)) {
                out.print(name + " ");
            }
            if (topicName.equalsIgnoreCase("OCL")) out.println("Houley");
            else out.println();
        }
        out.close();
    }
}